JPS59228296A - Color signal control display system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a display device such as a character display, a graphic display, etc. used as a display device in an office automation system (OA system), a remote video conference system (teleconference), etc. The present invention relates to a color display control device.

(b) Prior art and problems Conventional color display control devices have an image memory for the three primary colors of red, green, and blue for each screen, and the display contents are controlled each time by writing the contents of the image memory using data from the host computer. Change 1. A method is used in which the signal is converted into a video signal and displayed on a CRT monitor. For this reason, it has the disadvantage that a large amount of data must be transferred from the host computer when a part of the display image is changed or a new display symbol is added.

(C) Object of the Invention An object of the present invention is to provide a display method that allows for easy changes and additions to display contents on a display screen without controlling changes in the contents of an image memory.

(d) Structure of the Invention In the present invention, characters and figures to be changed or additionally displayed are written in advance with a specific color code in three types of image memory (red, green, and blue) prepared for each screen, and the external switch or control unit A circuit (mask color setting circuit) is provided that can suppress (called masking) or cancel the masking of the image by the operation of . In addition, a circuit (same color detection mask circuit) is installed to detect the same color code by comparing the output of the circuit and the output of the image memory, and to suppress the video signal output of the same color code (same color detection mask circuit) so that it is not displayed on the CRT monitor screen. It is something to control.

(e) Embodiment of the Invention An example of the configuration of a display control device according to the present invention will be explained with reference to a block diagram. In the figure, 1 is a control section, 2 is an R (red) memory section, 3 is a G (green) memory section, 4 is a B (blue) memory section, 5 is a same color detection mask circuit, 6 is a mask color setting circuit, and 7 is a video signal output section, and 1 to 7 are combined into one device. 8 is a CRT monitor, and 9 is a switch, which are generally installed outside the device.

The display control device transfers data from a host computer or the like by operating the control section 1, and stores it in the RlG, B color memories 2.3.4. Each of the color memories 2, 3, and 4 outputs the color data stored therein to the video signal output section 7, where it is converted into a video signal and displayed on the CRT monitor 8.

The above is the conventional color display control method. In the present invention, the outputs R, G, and B of the color memory 2.3.4 are output not only to the video signal output section 7 but also to the same color detection mask circuit 5. Further, the mask color setting circuit 6 sets a color code to be masked by setting from the external switch 9 or the control section 1, and outputs it to the same color detection mask circuit 5. The same color detection mask circuit 5 sends a match signal C to the video signal output section 7 when the color data B from the mask color setting circuit 6 matches the data A from the color memory section 2.3.4. In the video signal output section 7, the video signal corresponding to the data while the coincidence signal C is coming is masked and is not displayed on the CRT monitor 8. Therefore, write the characters and figures that you want to change or add in the color code together with the original image in the color memory 2.3.4 in advance, and mask only the changed and added color code by operating the external switch 9. If necessary, you can easily change or add information by removing the mask.

<r> Effects of the Invention In image display for OA systems and teleconferences, there are often screens that should be added and displayed later in the order of explanation. In this case, if the data is prepared in advance using the method of the present invention as described in detail in the embodiment, data will only be written once from the host computer to the display control device, reducing the computer usage time. When connecting via a transmission line, the present invention has a great effect because the line connection time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating a color display control device according to an embodiment of the present invention. In the figure, ■ is a control unit, 2.3.4 is a color memory, 5 is a same color detection mask circuit, 6 is a mask color setting circuit,
7 is a video signal output section, 8 is a CR'I' monitor, and 9 is an external switch.

Claims (1)

[Claims] In the color display method, which displays characters and figures on a CRT monitor while reading out the red, green, and blue color memory prepared for each screen, there is a circuit that can set a specific color code using an external switch, and a circuit that allows the output of the circuit and the color memory to be set. By providing a same color detection mask circuit that detects only the same color code by comparing the output with the output and suppresses the display, the color signal can suppress the display of an image written with a specific color code by operating a simple external switch. Control display method.